Letop



No. 625,3l4. Patented May 23, I899. T. C. BILLETOP.

TUBULAR STEAM BOILER.

(Application filed July 8, 1898.) (No Model.) 3 Sheets-Sheet l.

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No. 625,3I4. Patented May 23, I899.

T. C. BILLETOP.

TUBULAR STEAM BOILER.

(Application filed July 8, 1898.) (No Model.) 3 Sheets-Sheet 2.

No. 625,3I4. Patented May 23, 1899.

T. C. BILLETDP.

TUBULAR STEAM BOILER.

Application filed July 8, 1898.) (No Model.) 3 Sheets-Sheet 3.

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THE NORRIS PETERS co. PHOTCLLITHQ. vuswmavcu o c NITED STATES TORBENCHRISTIAN BILLETOP, OF NEWCASTLE-UPON-TYNE, ENGLAND,

ASSIGNOR TO ROBERT YOUNG MOINTOSH, OF SAME PLACE, AND

ELIZABETH CRASTER BIQEOHYNDEN, OF JOPPA, SCOTLAND.

TUBULAR STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 625,314, dated May 23,1899.

Application filed July 8,1898. Serial No. 685,423. (No model.)

To (all 2071,0712, it 77mg concern:

Be it known that I, TORBEN CHRISTIAN BIL- LETOP, a subject of the Kingof Denmark, residing at Newcastle-upon-Tyne, England, have invented acertain new and useful Improvement in Tubulous Steam-Boilers, of whichthe following is a specification.

This invention relates to certain improvements in tubulous steam-boilersof the class having horizontal upper and lower chambers connected by aseries of tubes, the invention being in part an improvement on that setout in the specification of an application filed by A. Blechynden in theUnited States Patent Oflice on the 7th. day of May, 1894, under SerialNo. 510,356.

Part of the invention is applicable to boilers varying somewhat from thetype above referred to.

The object of the invention is to increase the eificiency, whilereducing the cost of manufacture, the weight, and the space occupied.

The invention will be best understood by describing same with referenceto the accompanying drawings, in which- Figure 1 is a half cross-sectionof one form of boiler constructed according to my invention. Fig. 2 is asimilar view showing another form. Fig. 3 is a longitudinal section ofFig. l with parts in elevation. Fig. 4 is a plan taken on line as so ofFig. 3. Fig. 5 is a longitudinal section, with parts in elevation, of aboiler to show a modification.

All the drawings illustrate double furnaceboilers of the type abovereferred to, having an upper horizontal steam-and-water chamber A and alower horizontal chamber B, connected together by nests of tubes 0,which are curved in such a manner as to form a center space or flue Dand are adapted to be withdrawn through openings E in the sides ofchamber A when required. The openings E are closed, as shown, by platesand screws. There are two furnaces F, one being arranged on each side ofthe groups of tubes 0. To inclose or form the outside of the furnace F,an outer set of tubes are fitted between chamber A and a chamber G, theoutermost rows being set closely together and forming a wall H. Thewhole is inclosed in a light casing I, which may be fitted with a casingK, having an air-space between it and casing I. The gases after mixingin the usual combustion-chamber L flow through the curved tube-nests O,and their passage may be directed by setting the inner row of tubesclosely together, so as to form a tubulous wall'M, leaving openings N Nat the bottom or top, or at both, by suitably bending the tubes, asshown, these openings being so arranged as to gradually increase in sizetoward the front of the boiler, with the object of drawing the greaterportion of the gases to that end, as indicated in Figs. 1 and 3. Thebottom opening is preferably larger than that at the top in order thatthe gases may be drawn down between the front part of the nest. Theopening N should be of sufficient size to allow of the introduction of asteam-hose for cleaning purposes. In place of employing the close wall Mthe nest of tubes 0 may be open throughout and a baffle-plate 0 bearranged in the space D, so as to direct the gases downward, as shown bythe arrows in Fig. 2.

The gases after entering the center flue D pass below chamber A, alongthe bottom of which may be introduced tubes P, having their lower endsclosed and commonly known as Field tubes, as shown in Fig. 1, the objectbeing to extract or utilize the waste heat of the gases and materiallyincrease the heating-surface, and also by the circulation at this partof the chamber A to prevent accumulationof sediment'on the innersurface. The gases ultimately enter the end casing Q and funnel Q. Bythe arrangement of curved tubes 0, connecting chambers A and B, theouter tubes, which are those most exposed to the fierce heat of afurnace, have the least head of water against them, and this greatlyassists the circulation and permits of the boiler being forced to a muchhigher degree. To further assist the circulation, large downcomer pipesR, connecting chambers A and B, are employed,which are placed at theends of the chamber A and at the lowest point of same, so as to beentirely covered by the water in A even under heavy rolling of the shipthe tubes without removing any part of the casing, and the openings Eare placed so low on the chamber that no special doubling or thickeningplates are required, as where these openings fall in the thin shell ofthe upper part of the chamber, and, further, the internal baffle-platesU are kept high enough so as not to require to be disturbed whenexaminin g the boiler or withdrawing and renewing the tubes. Thearrangement of parts further permits,where the boiler is used in ayessel, of the decks being kept quite close down on the chamber Awithout making special provision for drawing the tubes, as it will beseen that they can be readily drawn out below the deck and, by reason ofthe curvature, in a downward direction into the interior of the vessel.

In Fig. 5 is shown a furnace provided with holes Y through the brickworkof the end walls for feeding air in above the fire.

In Fig. 2 is shown an arrangement of tubes V by which some tubes arebent in such a manner as to partly cover and support the verticalbrickwork of end wall or walls W, where often the usual means ofattachment are found unsatisfactory, this arrangement also addingsupport to the brickwork and enabling thinner and lighter bricks to beused.

What I claim is 1. In combination a single upper steamand-water chamber,a water-chamber beneath same, two groups of tubes connecting the twochambers, the tubes of each group" being formed on the curve of acircle, and said curves being oppositely arranged for each group so thata flue closed at the sides by said chambers and groups of tubes isformed, into which fine the gases enter and expand, a fur nace outsideeach group, water-return-circulating tubes carriedin the lower side ofthe upper chamber and adapted to extract the heat from the expandedgases in the flue between the groups of tubes and means for carryingaway the gases from the fine.

2. In combination, a main upper steamand-water chamber, a water-chamberbeneath same, a group of tubes connecting the two chambers, such tubesbeing formed approximately on the curve of a circle, a furnace outsideof such group and an end wall of refractory material to such furnace andtubes forming part of the group, elongated and spread so as to lie flatagainst such end Wall and form a support for same,substantially asdescribed.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

TORBEN CHRISTIAN BILLETOP.

Witnesses:

PERCY CoRDER, J NO. EDWD. MILLER.

